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Remedial Action Plan and Further Site Assessment 8 <br /> 7-Eleven Store No 19976 1399 N Main St Manteca CA May 30 2000 <br /> plume (in addition to petroleum hydrocarbons, which are generally less resistant to biodegradation) <br /> Various (mostly aerobic)microbial products are currently on the market, including Pelorus and Shell <br /> Research's Bioremedy The Pelorus product requires nutrient enhancement (i a using garden fertilizer), <br /> while the Bioremedy product requires only supplemental oxygen <br /> �i <br /> Usual methods of application Include Injection under pressure through a direct-push rod installed to the <br /> appropriate depth Interval (usually a range of depths Including the top of the capillary fringe to the base of <br /> the plume), and periodic injection through air sparge wells (alternated with oxygen or air Injection to <br /> provide the required aerobic conditions) Typical Injection point spacing is 10 feet apart regardless of soil <br /> ' type As the air and/or oxygen Injection process might also generate vapors in the vadose zone, <br /> concurrent vapor extraction is usually recommended As yet there is insufficient documentation to firmly <br /> ' establish the efficiency of this cleanup method for MTBE <br /> As an augmentation to groundwater extraction, this remediation method could be implemented upgradient <br /> of the extraction point, potentially reducing dissolved hydrocarbon concentrations prior to removal by the <br /> groundwater recovery system This could substantially reduce the costs of above-ground treatment of <br /> extracted groundwater <br /> r <br /> r <br />